Do_release_upgrade seems to have hung in the middle. Now what should I do

Great -
At this point I do suggest checks for cheap insurance of no issues and some clean up.

sudo apt update
sudo apt dist-upgrade
sudo dpkg -C

cleanup:

sudo apt --purge autoremove
dpkg -l | awk '/^rc/{print $2}' | xargs sudo dpkg -P

where “^rc” are packages (r)emoved but (c)onfig files remain.

-me likes clean-

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